It is well-known that tin sulfides
are tribochemically oxidized and the oxidized products continue to contribute to friction, unlike graphite that is oxidized to form the gaseous C[O.sub.2] which leave the friction environment.
The "Dayang-1" vessel arrived at the ocean's polymetallic sulfide
exploration contract area on Jan 26 and left on Feb 19.
The biogas consists mainly of methane (50-80%), carbon dioxide (20-50%), and a mix of trace gases including nitrogen (1-4%), hydrogen sulfide
(50-5,000 ppm), and others.
A novel facile method to metal sulfide
(metal = Cd, Ag, Hg) nanocrystallite.
Respiratory and metabolic response to sulfide
and hypoxia in the marine echiuran worm, Urechis caupo.
In rocks more than 2.7 billion years old, sulfides
typically show no sign of sulfur-34 depletion, says Philippot.
If reduction regimes become sufficiently intense, sulfate is reduced to sulfide
(van Breemen 1976), which then reacts with iron to form iron sulfide
In coal deposits, the surrounding rock typically contains 2-5% sulfides
, most of which is pyrite.
The heavy metal sulfides
also can be oxidized to much more soluble sulfates by dissolved [O.sub.2], releasing the toxic metals and rendering them biologically available.
Catalytic carbons can be used to treat sulfides
in water because they promote the oxidation of sulfides
using dissolved oxygen which is present in the water.
Other articles discuss thermodynamics and kinetics of hydrogen sulfide
in natural waters, hydrogen sulfides
in oxic seawater, microbial metabolism of dimethyl sulfide
, decomposition products of DMSP in anoxic marine sediments, and more.
It consists largely of zinc sulfide
in crystalline form but almost always contains variable iron.